Theodor Riphaen or Theodor Riphan (1577 – 14 January 1616) was a Roman Catholic prelate who served as Auxiliary Bishop of Cologne (1606–1616).^[1][2][3]

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Theodor Riphaen was born in Neuss, Germany in 1577.^[2][3] On 30 August 1606, he was appointed during the papacy of Pope Paul V as Auxiliary Bishop of Cologne and Titular Bishop of Cyrene.^[1][2][3] On 3 March 1607, he was consecrated bishop by Attilio Amalteo, Titular Archbishop of Athenae.^[2] He served as Auxiliary Bishop of Cologne until his death on 14 January 1616.^[2][3]